Display Defect Correction via Bidirectional Sub-pixel Interpolation
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Solution Overview
Problem
Existing display technologies face challenges in effectively correcting for defective light-emitting elements, particularly those that are stuck on or off, or not responsive to control signals, leading to non-uniformity and reduced quality in full-color displays.
Innovation Solution
A full-color display device with a controller that transforms input signals to compensate for defective sub-pixels by selectively modifying the output of neighboring sub-pixels, utilizing additional in-gamut sub-pixels to minimize spatial non-uniformity and maintain desired luminance and chrominance, while optimizing power efficiency and manufacturing yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If defective light-emitting elements are corrected by driving neighboring sub-pixels of common color, then the defect is compensated, but visible spatial artifacts are created due to the distance between sub-pixels
Solution Approach 1:
The patent transitions from one-dimensional linear interpolation to two-dimensional bidirectional interpolation by utilizing both horizontal and vertical neighboring sub-pixels. This dimensional expansion allows the correction to spread across a larger area, reducing the concentration of artifacts at any single location while maintaining the defect compensation effect.
Solution Approach 2:
The patent applies different interpolation weights based on the spatial relationship between sub-pixels. By using bidirectional interpolation with distance-based weighting, closer sub-pixels contribute more to the correction than farther sub-pixels, creating a localized correction zone that minimizes spatial artifacts while effectively compensating for the defective element.
2Reliability
If all color sub-pixels in neighboring pixels are used for compensation, then the defect is fully corrected, but power consumption increases
Solution Approach 1:
The patent applies partial action by selectively activating only those neighboring sub-pixels that are most effective for compensation based on their spatial proximity and color similarity to the defective sub-pixel. This partial compensation approach reduces the total number of active sub-pixels compared to using all neighboring sub-pixels, thereby lowering power consumption while maintaining adequate defect correction.
Solution Approach 2:
The patent dynamically adjusts the drive signals to neighboring sub-pixels based on their distance from the defective sub-pixel and their contribution to the correction. By modulating the intensity and duration of activation for different sub-pixels, the system optimizes the balance between correction effectiveness and power consumption, avoiding the need to activate all neighboring sub-pixels at full intensity.
Data Source
AI summary
A full-color display device, comprising: a) a display having a plurality of sub-pixels formed in rows or columns in a first dimension including at least three different color sub-pixels forming a color gamut, and grouped into pixels within each row or column, each pixel including at least two of the gamut-specifying color sub-pixels and at least one additional sub-pixel having a color within the gamut and an efficiency higher than at least one of the color sub-pixels, wherein at least one pixel is defective and comprises one defective additional in-gamut sub-pixel; and b) a controller for driving the display pixels and for transforming an input signal into a compensated signal for selectively modifying the output of at least one color sub-pixel in the defective pixel, at least one other, but not all, of the color sub-pixels in a neighboring pixel in the first dimension, and additional in-gamut sub-pixels in neighboring pixels in a second dimension, the at least one other color sub-pixel including the sub-pixel in the neighboring pixel that is closest to the defective sub-pixel, to compensate for the output of the defective sub-pixel(s).